[Bug other/121958] Document requirements for updating *opt.urls; advertised method does not work

[tkoenig at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121958

--- Comment #3 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Created attachment 62389
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=62389&action=edit
Patch which does not regenerate *.urls

Here's the patch.

Configure was

../trunk/configure --prefix=$HOME --enable-languages=c,c++,fortran